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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a926dedd6ccb044c1f606d508cf98149610cd40e9c06b70baf385e047680079' 
  AND token = '1rN2bQiyV8yx2y/CEWTo/pfEkjOMtDiCNt8pkG0hGu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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