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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e2258899449b800c8152d3063aa5d3e0aee14ec1289c54be2ee1736e2e71a8' 
  AND token = '/T5QMCWiJR9dd3fqJx2p9kNINeU/0cuoQGbf6CPg8E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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