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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a994d634000914f7e2ec490bb1ceb15b47c9f78802bb5597e20e517b0245f30' 
  AND token = '+GXwUgrszRj93AIZcsqIwNjZNxRdqZc6kucZT/d966M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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