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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79969303e1b157d3d44b52f79d29afb3d8412a2938f99e5a4cab091d0493af36' 
  AND token = 'OhrKm09J8bqk3MmTwZ3558MocS5XiWcGx7dYRTL8YhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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