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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df91ae3a4644eb3c93d017cbcc422c6e22a358e3d11324df57dd472d2ca7f389' 
  AND token = 'cvlwCE3fXp6/n5xvuT3aUNlwshw4tKy6ctSGaBM5lSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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