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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa839ffb1c51f5cbbd0cfa2afa2b7b613f2026d0424ed7de1c224e281aa0174' 
  AND token = 'ZOxtZlbTizRkuIaQe5WtYzVapKfrX8KmehUoLy81yDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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