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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a5badb3d0d173c7269ef82da76439b389dc632ebd12a974019a50355ed83da' 
  AND token = 'ko8ikRLQRrAHzs66gv5vWBf4Tlh5Dc9UrzKFW0lMWTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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