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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f986ef9ee7034e0918ed600d116a0ad207973af243ac687b5f366482289babc' 
  AND token = 'fr9h1PGwveQu7kgRkyawn3+HBW4f9Ehs1znbx9c0dlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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