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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7767b66631a9d144b97b8ff8e22daa4ba31f08fafd0d5551cd47f511afe5bac6' 
  AND token = '25Q6P9WrTyzIISR/gQ3njk4xWSGqajeLU19vP7OjEv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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