SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c44de702330e6492da6fd25fb793dfbb586d9f54c5c2cd5848dfc8191c1ab0' 
  AND token = 'XRGI6U+dC4+fq3+LxKLCowsm0t5mbfwZUVnABmKOlEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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