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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd690bec35dfc6b720979da7f9a91c861ac309b36950093f52a72b67fd63ff876' 
  AND token = 'x1yQEU+EX3b40gf8Pmw/aevrL1fju8rFc4E/uMWI7oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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