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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a9a90eabaa9d089fe8b641519e78d057cc897855fabd786aa89ad7f2effbe3' 
  AND token = 'cdbUfvYeEpkzJ44+RPeLbC/7SHWXyo6Gi0KAY4+Juqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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