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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88808673d0050878ec625965a2e47df86e3e9909799def41e591490ddd010d5d' 
  AND token = 'lVEr6O7P388wARGwasFEzO/AnSF7pXgyGeh86/GyvPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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