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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3874c914cd751f5e91a92175caa753937609c5c7656cbf164b067a323aa8e8bb' 
  AND token = '9YNT8owp+lVyOxKFkoGdF3kyTk3BUz7HddPD6RCGHjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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