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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed58139f4c66e6f123505ab60c53ae4c7ed7899f2703bc55bc323d745077f7f2' 
  AND token = 'FUMhLjTvGcbcmi9dFppQ9dVOVnaiPJcmPvxqhRPjPEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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