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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829ca03c0bbc5bdcc1b01dd651116bde9c67af516e3d5a62b0931c98f02adbf3' 
  AND token = 'hYSRVwGU1mn0+0kgoWn+oXAJMnfJwy4v5/iAqOSfzjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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