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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208bef73088827414c51df5440e906edebb5af5fd1e61ed37cae061fb604f218' 
  AND token = 'FxD/CBKAiElowKCGruEpWbchm56CLQHB+tsVXDLCqfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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