SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4963b88d04953d100e0f8af01cfbe69f8a4aa90e49f8841d946215efc8a7f2' 
  AND token = 'aGjVv/mKY/3k3zx2jq22fBdT9CHpyPdwH2NvWX+5FU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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