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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8cda56a07678258b1b3cee679b189277a63d89e68481db398173d1ebfe770d' 
  AND token = 'Z9+C8OWc26bnWIKQzqA9v4Ojd1hYASsXZVIZCJgP3Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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