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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa110be44f0bff31142f4629041e490e433be513f060fc1789bb403eadf97a1' 
  AND token = 'ObxI2J8WJrsNID8dhVAOJMrutEWH5tZ3f0XGmGNA4rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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