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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76127f8b14348c967c539110ffc0f5f1b83a058d803cc46fca9e128ca25346c7' 
  AND token = 'CVmHqCDg0XYgI61MFGdh6V6H5l1NmHPEhDMA0tvVMKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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