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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb73640adeae6aa81d6239395f88531d9889540d56c1e2f5908744019664b292' 
  AND token = '6yr4HZLpa1cdHW4tVh7SLnACS/tbjjoaz1nOTAMZyME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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