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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d91bb97a85f478f3d26c9efea3feb1d9ba085c481afcebc3150307bd746716' 
  AND token = 'S4XHJHQyfB46wEPTl/XnFq5xhL2XJTywR0/2uHbTVIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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