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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ab0d3e3f16db2236fad3e39663d8e0ae0f36235c7f6225b42daaa3e1609dd2' 
  AND token = 'pLKN9uI073ch85sogEfT4wYe2ucKFmZB+tgGOMtvNmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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