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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931d740e5a616198ce8252b3df61c9f7f71e3964a1187a7cf3c9c0d22c1f0613' 
  AND token = 'croC3HIcpgmBvC+qk/32akE4LmDlTquymtBrUbFX6Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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