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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be35d7c92f48b1ce57eb9751da499100de4d402910ab03540785d4f8dca8d2de' 
  AND token = 'axFtUf+MlJe5as0Zt6+rjPWxUf6RkjhT5YTpltZ7gus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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