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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35821bc89f81d778554f04656034d57c26af53ed8662d37121f4e37c22871954' 
  AND token = 'FxkJoe0ZtdK7cm3drXjWIH5RCsFdoBenETXdFhpk75U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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