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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12adac6ecddb2b76be7667be38c807a7a033288a4b800167f61ff02cf71e561' 
  AND token = 'hKEWrXVgyJdWsPv9ip89j3vvILqtjI+G0622Xyq9IuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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