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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8356d6cc10a004d69cdb181841db509ad8a2349efbc4e41245b06d00671b16' 
  AND token = '/AmKFa1I/5JVMINmOdBArz5tlYT0n8cQtU/0Fkml+0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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