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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca5a3d0e1a183d3303c0a9b18d04db8f3c398258790aa6c96303b3fc3214a7a' 
  AND token = 'KCcu6suJBbk5MK/h2Oa1ZTXglY2xg+UpfWYyGx+wG/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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