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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ae9ca1bea78d912b16d74fa9c51dabff03a194957ffc70dc4edad375809808' 
  AND token = 'S6EFsD0JoiMVYFkxMkKz9A3p24b2iQCBDzNejoHooYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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