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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ae9f59b162deecae39da60c5cc020df48e8eb638507c381a78f104b26aa5c8' 
  AND token = '1/4D/J98k84qJhr9gvztgHVBt/7QC6qCQbJ/aXmefQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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