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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed32486767ea8b45c3bd992a56e911e3ff5f6057cd42b24a98667eb4046f2f24' 
  AND token = '6B4MpQ34GIeotBaCxeldEAFj8Yx99tRDHKe/Syyz74Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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