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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c09c1934331a30f2d133bf7c6af8b9ea66f27e99ae0db9b69e0689d059dff0e' 
  AND token = '3Ln3PpQpkXzT1vgDGPhm1rGEJFi5QzDd6EIX4C6HyyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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