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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a84421200fe001264249959b4cf411894f43a2ab66cb70d23c24fbc649d6c3a' 
  AND token = 'u9XjcHjXHgXPAYhnJy3EyhW4/v2Pmry8iflYUqr+/og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}