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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0f4d7ba02faeb1b3d972befc3d6ebe80d7c5f72dc2477607d031926a78d5e8' 
  AND token = 'eHgAfMUTIfKjo+OX5ac00SycMA4SC9IjzgX783Hn9NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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