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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba4097b6a5bc2bb9f2c93b5d96f0a268e4e4a9f481d261882fc1f6044ee997d' 
  AND token = 'wuhE9iJYHbKvT19pf9+6vjPip+netyre5xnWVo5tZx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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