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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd465ac5d3577ae67b2f05c4319c8173bd0ba269ece5022627b2df4f59415054e' 
  AND token = 'xaUqtutMe422aAg7a5+gx7J6OreEEs1XjnZ6ILdhM9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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