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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696afee07d1ee11e8289d48d9e9d32cb21ae711ebb8a703a6f7dbeb693213206' 
  AND token = 'tRQnEJRCz4Az/MIO0mN5CVfKp9z5iUZjtJm9ocOXf78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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