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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecd0d6c2797fec799cb35191da15c706fc18fe82334499d7318be428bce6ccc' 
  AND token = 'H+mwqxV8fA33j6GUC7dklxu/WQxsYuzeWWeVX9iPAbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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