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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2df0552093f8c0850187bf41e21ffeeacab385e4fff3aac839239975da8ac7' 
  AND token = '9TcFocysCJS8b2juHPNfiBE4l34/+NVm7EHjARNYabs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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