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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4b2a4df01d506b2dfd0ab08cdc826a215613badd4027e1cfefb8b3fcfd65e9' 
  AND token = 'qg79zXHmPjr6Q/8c2mTcKrQxh/nH+bMQi4m9Gyw0co8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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