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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148869412cb56eaff0cc67577b652dafcd5101da8851812998d843b794075859' 
  AND token = 'ZYAQbYexz96d29mXkj1sn0BQ7pTMR7zRwJNRyJw+7co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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