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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc05b6f08cd8a43c27a6e94ef8d339a86c16fb9b609622d970d92065366a28d' 
  AND token = '0fjbS3Sc88oApGC9Qv5kESpVcvczr0tDbmHbTLl4JKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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