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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c1924305e075bea04c62556e5b98612c1a46645163cca49535c551c163a97e' 
  AND token = 'lOjTRHkO5QyV1opN+0ZneM4pZ/SjBCyMzoRVqU9slsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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