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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab76e3de5ec68a9211777910e66546909c4ef2cbfbbd317b1026a9b61bd14627' 
  AND token = '85/3rcIUWaDtBXUf+kbA6XkAbJTy2eg99r89e0kxb3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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