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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae60184dbddf6603c636eb0e2118668e8d8e85aa43ec380a8a152624df6be393' 
  AND token = '2NJh1JnDF8823GxBnvevA5IcP6H6JBWREgknS/Zilig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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