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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e82e20eecd4684d137c8b35cda2ac4dcc6378dd70527cc3caedf678b4582c39' 
  AND token = 'slcZKIktlPJUwS5Ccu1JznLkqy7bQO9n24YHNKNbB5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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