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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06826fef6222e24e0ebcd4260af760b9b7f5f8cb46d20b173c0e2ca6d64acecf' 
  AND token = 'L2mHjXmlVFhf4PD3EPZgOalB8XS1eoGAIe07xXxuOQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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