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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9a0efcdb56c91b482f1db0927989eadceb5233ae9378e41826058255d5b967' 
  AND token = 'NMI1cfkB0dxRvj7nT/HpdUhwxU6vjzZ401ZYEmstDvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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