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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a7d74aee32633fd3fb47d7e68493aa1ecf459bc90e6d42a88b48041eb3cba8' 
  AND token = 'cfT+LOgDneplbapQs5wMkMIXBUavojJc86KTV1eFadM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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