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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218059e69a01ed69b4f27c37d6e88118840219108ca71385289debd9d7a72b6e' 
  AND token = 'HKGPOD5g35+EpNRATUjptrogNqY9O1KxP877j8lM9qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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