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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479ee6681d73f1593c23e36d98ef92d14348ed2a536e9035570e1c0741e2e31f' 
  AND token = '5UKNiw3GYL06Maw4HwVlWD4g7qSbp0DvVj6MlVOWmSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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