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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490e2792e2809742f75077d10dd2e3d75bbfa5f68d2fd7feaee4fd51707a2c6f' 
  AND token = 'NkMy0V/tXA200nJRK9r7CfAkhqA8LSwQx6IlpT5WnuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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