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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd49fe6b3d88a6df567edb679195c105795dc206db47f6eae9fe1625a276dd3' 
  AND token = 'lbqPmv9Ye04Bjq36kn6q+lG7KTWyFotMdeasVm49WJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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