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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca96aff615b0015ae0ef5de56ddf09049b977148ae176c11fef2f81121f4bc1a' 
  AND token = 'Lhxr+WMhj6AVxTYoMjsuo9hRfdBCM3Li20eAk8kZtXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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