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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fafff7e10b07b25fef651947fad0507eb893b741ebfb092cda1ed0715360b2' 
  AND token = '7bwHwK3pYKGMjJCnxkALA06RxXnHxsKnOLRuMuRyH6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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