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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6170f3a9aae230a6e5800494b230eafa990ae5ed971edd9bf7e05ab2bf237cc' 
  AND token = '+bE85lU3UxukXXP8arwZyCuIpfac8jzqnJjZ4CA9ojg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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