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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7bd712e26ab3af84b84b3c911e6f4b144fce40feed18c77de2ba447eb323a7' 
  AND token = '1Qp44inNkaOcLnrCmlMQXG1kCoudDx5Nl7tn7scK23E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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