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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4f8de088ea4cb784edc0b72ef92d7f82e516d63ae384fba86266040d550057' 
  AND token = 'cHCU9uyp/ZIlMpqC+7yu7DsD0a6bwgqgpffkqugowDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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