SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c44eeb7f56149669faf0c553d708d2900ae6c5914d80e834189e122f1cbe7d' 
  AND token = 'bPJ+2zjZBqw30tehRl2rNAzaadG8ET2gujxIxjl+73Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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