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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7925e86245e530452a911ba594e6b87d8cf5954782e988601888ea9a3a2cbff' 
  AND token = 'ZwDkPkvyb0YzWwSVCyx0hkmBB8AL6our+X/Cpry0Z+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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