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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23f1d0faafe8f0b28c7d1b0cf853c7047fa08943c4a7a0329d4434555e2da18' 
  AND token = 'nfRFpSqfTSOFEGUKJ4pafFx3UFblRBwazK/cSJwfZXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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