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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690e6f084ea3427ab453e43103cfd13d31b071a1b9887b73a12ba2fd6567d28a' 
  AND token = 'S2d21S597Hbkq038MQKxkDIFkR+CV/mk3nIWiSd0wN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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