SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa59d09e5ecb2313f699594a589740f1bf6c71e957d5792754c34a1ce8d01b0' 
  AND token = 'elPROE0N9uxUldjB35gqJLRIKz/Lb7vyHpuQgB+QRMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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