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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc5e9b0f53e1537be94983270d15e95ec9b709df55f16dbf4a557f3952e65eb' 
  AND token = 'K0qqlUsa2OKaqlGpuCtx/WZhsNTfafuU3s+UJdUWfb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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