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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dd09e7d705e3dd584de21b5a74ffb5b24126ffe3d9ab7627b1dd0135139496' 
  AND token = 'Piq416tyJNW+zQ/CEAdSw5hNmKdfcgqie9FbzV7FC7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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