SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d114cf22e58abf17418c98985fa3fc131c7493ad0b9a8cfd7916e79f9a6f13' 
  AND token = 'sZj7CKojuyRwDmUHJvttL5MMisYVaEF/ZzbcMPCkFts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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