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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f96fb4e46e3c9bc855029a66453d58c0f18cb603c0f83d289e4e02465dc54b' 
  AND token = 's+MlFmIe1JeeE+cjaGrRX3UnJLU/ASCDKLlg6/GXT9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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