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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2464dc7001bfa325af4f0387c3dafb9fe35301e6b37fe9143abcba4d21761ac1' 
  AND token = '9vbSzSd/mpbODygKJ+TCMb2J/d5HASw9r2HDHCxQrW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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